Rotor structure

Abstract

A rotor structure includes a silicon steel main body with a plurality sets of magnetic poles, an axis and an outer edge. Each magnetic pole has a double-layer V-shaped magnet slot structures including an inner V-shaped magnet slot set near the axis and an outer V-shaped magnet slot set near the outer edge. The inner V-shaped magnet slot set has an inner magnetic bridge, and the outer V-shaped magnet slot set has an outer magnetic bridge. The width of the inner magnetic bridge is greater than the width of the outer magnetic bridge. Each magnet slot has two long edges. One of the two long edges that is relatively far away from the corresponding inner magnetic bridge or outer magnetic bridge has a blocking point. The inner V-shaped magnet slot set or the outer V-shaped magnet slot set has a pair of radial magnetic bridges.

What is claimed is: 
     
         1 . A rotor structure comprising:
 a silicon steel main body has a plurality sets of magnetic poles, an axis and an outer edge, each set of magnetic pole has a double-layer V-shaped magnet slot structure;   wherein the double-layer V-shaped magnet slot structure includes an inner V-shaped magnet slot group near the axis and an outer V-shaped magnet slot group near the outer edge, the inner V-shaped magnet slot group has a first included angle between a pair of inner magnet slots, the outer V-shaped magnet slot group has a second included angle between a pair of outer magnet slots, the first included angle is smaller than the second included angle;   wherein the inner V-shaped magnet slot group has an inner magnetic bridge close to the axis along a radial direction, and the outer V-shaped magnet slot group has an outer magnetic bridge close to the axis along the radial direction, a width of the inner magnetic bridge is greater than a width of the outer magnetic bridge;   wherein any pair of the pair of inner magnet slots and the pair of outer magnet slots has two long edges, and the one of the two long edges that is relatively far away from the corresponding inner magnetic bridge or the corresponding outer magnetic bridge has a blocking point;   wherein the silicon steel main body has a rivet point, and a connection line between a geometric center of the rivet point and the axis passes through the inner magnetic bridge and the outer magnetic bridge; and   wherein the inner V-shaped magnet slot group or the outer V-shaped magnet slot group has a pair of radial magnetic bridges extending from the pair of inner magnet slots or the pair of outer magnet slots respectively, and the pair of radial magnetic bridges are farther from the axis than the inner magnetic bridge or the outer magnetic bridge.   
     
     
         2 . The rotor structure of  claim 1 , wherein the width of the inner magnetic bridge is 1.5 times an air gap width between the rotor structure and a stator structure. 
     
     
         3 . The rotor structure of  claim 1 , wherein the width of the outer magnetic bridge is equal to an air gap width between the rotor structure and a stator structure. 
     
     
         4 . The rotor structure of  claim 1 , wherein the pair of radial magnetic bridges have a width greater than an air gap width between the rotor structure and a stator structure. 
     
     
         5 . The rotor structure of  claim 4 , wherein the silicon steel main body comprises a plurality of silicon steel sheets stacked along an axial direction, and the width of the pair of radial magnetic bridges is smaller than a thickness of a single one of the silicon steel sheets. 
     
     
         6 . The rotor structure of  claim 1 , further comprising a plurality of magnets disposed in the pair of inner magnet slots and the pair of outer magnet slots, each of the magnets has a width W, and the blocking point has a height h, wherein W/10≤h≤W/5. 
     
     
         7 . The rotor structure of  claim 1 , wherein the rivet point has a rectangular shape or a circular shape. 
     
     
         8 . The rotor structure of  claim 1 , wherein the silicon steel main body further includes a plurality of magnetic barrier structures disposed close to where between the outer edge and the pair of outer magnet slots. 
     
     
         9 . The rotor structure of  claim 8 , wherein each magnetic barrier structure is selected from the group consisting of a rectangular magnetic barrier with a long axis direction perpendicular to the outer V-shaped magnet slot group, a rectangular magnetic barrier with a long axis direction perpendicular to the outer edge, an arc-shaped magnetic barrier with a curvature center facing the outer V-shaped magnet slot group, and a semicircular notch magnetic barrier formed along the radial direction toward a periphery of the outer edge. 
     
     
         10 . The rotor structure of  claim 1 , wherein a ratio of the width of the inner magnetic bridge to the width of the outer magnetic bridge ranges from 1.2 to 1.6. 
     
     
         11 . A rotor structure comprising:
 a silicon steel main body has a plurality sets of magnetic poles, an axis and an outer edge, each set of magnetic pole has a double-layer V-shaped magnet slot structure;   wherein the double-layer V-shaped magnet slot structure includes an inner V-shaped magnet slot group near the axis has a pair of inner magnet slots and an outer V-shaped magnet slot group near the outer edge has a pair of outer magnet slots;   wherein the inner V-shaped magnet slot group has an inner magnetic bridge close to the axis along a radial direction, and the outer V-shaped magnet slot group has an outer magnetic bridge close to the axis along the radial direction, a width of the inner magnetic bridge is greater than a width of the outer magnetic bridge;   wherein any pair of the pair of inner magnet slots and the pair of outer magnet slots has two long edges, and the one of the two long edges that is relatively far away from the corresponding inner magnetic bridge or the corresponding outer magnetic bridge has a blocking point; and   wherein the inner V-shaped magnet slot group or the outer V-shaped magnet slot group has a pair of radial magnetic bridges extending from the pair of inner magnet slots or the pair of outer magnet slots respectively, and the pair of radial magnetic bridges are farther from the axis than the inner magnetic bridge or the outer magnetic bridge.   
     
     
         12 . The rotor structure of  claim 11 , wherein the width of the inner magnetic bridge is 1.5 times an air gap width between the rotor structure and a stator structure. 
     
     
         13 . The rotor structure of  claim 11 , wherein the width of the outer magnetic bridge is equal to an air gap width between the rotor structure and a stator structure. 
     
     
         14 . The rotor structure of  claim 11 , wherein the pair of radial magnetic bridges have a width greater than an air gap width between the rotor structure and a stator structure. 
     
     
         15 . The rotor structure of  claim 11 , further comprising a plurality of magnets disposed in the pair of inner magnet slots and the pair of outer magnet slots, each of the magnets has a width W, and the blocking point has a height h, wherein W/10≤h≤W/5.